package com.jeesite.modules.interceptor;


import com.fasterxml.jackson.databind.ObjectMapper;
import com.jeesite.common.collect.MapUtils;
import com.jeesite.modules.annotation.RepeatSubmit;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.lang.reflect.Method;
import java.util.Map;

/**
 * 防止重复提交拦截器
 * @author guohusong
 * @version 1.0
 * @date 2022/2/14 11:26
 */
@Component
public abstract class RepeatSubmitInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
    {
        if (handler instanceof HandlerMethod)
        {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Method method = handlerMethod.getMethod();
            RepeatSubmit annotation = method.getAnnotation(RepeatSubmit.class);
            if (annotation != null)
            {
                if (this.isRepeatSubmit(request, annotation))
                {
                    response.setCharacterEncoding("UTF-8");
                    response.setContentType("application/json;charset=UTF-8");
                    response.setStatus(200);
                    PrintWriter out = response.getWriter();
                    ObjectMapper jsonMapper = new ObjectMapper();
                    Map<String, Object> resultMap = MapUtils.newHashMap();
                    resultMap.put("result", false);
                    resultMap.put("message", annotation.message());
                    out.print(jsonMapper.writeValueAsString(resultMap));
                    out.flush();
                    out.close();//
                    return false;
                }
            }
            return true;
        }
        else
        {
            return true;
        }
    }
    /**
     * 验证是否重复提交由子类实现具体的防重复提交的规则
     *
     * @param request 请求对象
     * @param annotation 防复注解
     * @return 结果
     */
    public abstract boolean isRepeatSubmit(HttpServletRequest request, RepeatSubmit annotation) throws Exception;
}
